Photophonic transmitter



J E. BERLINER. Photophonio Transmitter No. 235,120 Pater lte gi Dec. 7, 1880.

(No Model.)

UNITED STATES PATENT OFFICE.

EMILE BERLINER, or BOSTON, MASSACHUSETTS.

' PHOT PHQNi rRANSMI'rTER.

SPECIFICATION forming part of Letters Patent No. 235.120. dated December 7,1880. Application flled September 3. 1880. (No model.) I

1'0 all whom it may'concerrtr In the drawings, A is a heat-flame of low Be it known that I, EMILE BERLINER, of luminous ,uality-as, for instance, a Bunsen 5 Boston, Massachusetts, have invented a new flame or an oxyhyurogen light. B isa pencil and useful Photophonic Transmitter, of which of platinum, calcium, asbestus, or similar .rej 5 the following is a specification. This improvement relates to that kind of tact with the flame. The pencil is attached to instruments called photophones, in which a the center of a diaphragm, C, suitably mounted o beam of light is set into vibration by being and provided with a mouth-piece like the reflected from avibratory reflector, or in which mouth-piece of an ordinary Bell telephone, and f f-ff- 10 the amount of light transmitted at each soundthis diaphragm may or may not be provided vibration is regulated by the movement of a with a damper, D. diaphragm or other vibratory medium. By uttering now or producing sound in the 5 In my improvement I make use of a heatneighborhood of the diaphragm the same will flame of low luminous quality-as, for in-. vibrate, and the pencil B will be brought in r 5 stance, the flame of a Bunsen burner, or of an more or less contact with the flame and will oxyhydrogen light, which is hardly visible, give out alight of varying brilliancy, each but which may heat other substances brought vibration in accordance with the amplitude of 5c into its reach to incandescence, so that they the transmitted sound-wave.

become luminous, and to an extentas they are I do not broadly claim the art of trausmit- :0 brought into contact with the flame, and I arting undulatory light-waves corresponding to j rangea pencil of platinum, calcium, asbestus, the undulatory waves of sound and articulate '1 or similar refractory substance so that its speech; but v 5 5 point is just in contact with the said flame, What I do claim isand I vibrate this pencil by means of a dia- A photophonic transmitter consisting of a 2 5 phragm, to which it is secured, or by which it heat-flameoflowluminous quality, A, apencil, may be acted upon. By this means I bring B, of refractory substance in contact with the flame, and the light emitted by the pencil will for the purpose set forth.

there ore in strength he proportionate to t e o amplitude of each vibration, and light-waves, EMILE BERLINER' varying in intensity and number in proportion Witnesses: to the transmitted sound-waves and their in- A. I. PHIPPEN,

tensity, will result from this manipulation. (3150. W. Prunes.

fractory substance, with its point just in wumore or less of the pencil in contact with the flame, and diaphragm 0, substantially as and 60 r 

